Problem is here Element, document, and window can be an EventTarget. You should detect your EventTarget if is an element. So in your case below code should work linkProvider = (ev: React.SyntheticEvent<EventTarget>) => { // If event target not an HTMLButtonElement, exit if (!(ev.target instanceof HTMLButtonElement)) { return; } console.debug(‘ev.target’, ev.target.dataset[‘ix’]) } In the short … Read more
Try to use <span data-bind=”click: function() { function1(); function2() }”></span>
HTML5 introduces a hashchange event which allows you to register for notifications of url hash changes without polling for them with a timer. It it supported by all major browsers (Firefox 3.6, IE8, Chrome, other Webkit-based browsers), but I’d still highly suggest to use a library which handles the event for you – i.e. by … Read more
To capture all error events on the page, you can use addEventListener with the useCapture argument set to true. The reason window.onerror will not do this is because it uses the bubble event phase, and the error events you want to capture do not bubble. If you add the following script to your HTML before … Read more
Have you tried maintaining a reference to the anonymous function (like you suggested)? So: var listener = function() { check_pos(box); }; window.addEventListener(‘scroll’, listener, false); … window.removeEventListener(‘scroll’, listener, false); Mozilla’s docs suggest the same thing.
For those looking for a practical solution, see: How to find event listeners on a DOM node when debugging or from the JavaScript code? EventListenerList was in some old draft of DOM 3 Events and was long removed from the spec. As far as I know, at least Gecko still doesn’t have anything like this … Read more
Test for the enter keycode (13) and if shift key was pressed. …onkeyup = function(e) { if (e.keyCode == 13) { // if (e.shiftKey === true) if (e.shiftKey) // thruthy { // new line } else { // run your function } return false; } } Edit: Accept all truthy values of e.shiftKey
The reason why event bubbling exists is solve the ambiguous question of which element is the intended target of the event. So, if you click on a div, did you mean to click the div, or its parent? If the child doesn’t have a click handler attached, then it checks the parent, and so on. … Read more
The JavaScript Window object is the highest level JavaScript object which corresponds to the web browser window. The document object is the container for all HTML HEAD and BODY objects associated within the HTML tags of an HTML document. This could correspond to the top-most window, or an iframe within the window. Update After a … Read more
Sure you can, using the brand new APIs. window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem; window.requestFileSystem(window.TEMPORARY, 1024*1024, function(fs) { fs.root.getFile(‘test.bin’, {create: true}, function(fileEntry) { // test.bin is filename fileEntry.createWriter(function(fileWriter) { var arr = new Uint8Array(3); // data length arr[0] = 97; // byte data; these are codes for ‘abc’ arr[1] = 98; arr[2] = 99; var blob … Read more